scholarly journals Optimal Irrigation Mode and Spatio-Temporal Variability Characteristics of Soil Moisture Content in Different Growth Stages of Winter Wheat

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1180 ◽  
Author(s):  
Yujian Yang ◽  
Yanbo Huang ◽  
Yong Zhang ◽  
Xueqin Tong
Keyword(s):  
Moisture Content ◽  
Winter Wheat ◽  
Time Domain Reflectometry ◽  
Sequential Gaussian Simulation ◽  
Growth Stages ◽  
Evolution Characteristics ◽  
Spatio Temporal ◽  
Jointing Stage ◽  
Gaussian Simulation ◽  
Different Growth Stages

To advance site-specific management of soil volumetric moisture content (VMC), this study analyzed the spatio-temporal evolution characteristics of soil VMC using the method of sequential Gaussian simulation (SGS) during the different growth stages of winter wheat. This was compared with data measured by time domain reflectometry (TDR) which is a well-established electromagnetic technique to measure soil VMC. The spatial autocorrelation coefficient of VMC indicated the strongest clustering of VMC in the tillering stage, and the least clustering of VMC in the harvest stage. A threshold of VMC in topsoil in the jointing stage of winter wheat was put forward. This threshold is 26, signifying that at a lower value, irrigation should be performed and irrigation efficiencies can be improved. Stable and sub-stable areas in the spatial variability maps of VMC were identified in the winter wheat jointing stage. Furthermore, the optimal irrigation stage was the early jointing stage, and irrigation was performed once as a guide. A loose-couple spatial model was constructed using the VMC in topsoil and the volume of water for irrigation. The VMC in the jointing stage of winter wheat was linked with efficient and water-saving irrigation.

scholarly journals The Modification of Difference Vegetation Index (DVI) in middle and late growing period of winter wheat and its application in soil moisture inversion

2019 ◽  
Vol 131 ◽  
pp. 01098
Author(s):  
Zhang Hong-wei ◽  
Huai-liang Chen ◽  
Fei-na Zha
Keyword(s):  
Soil Moisture ◽  
Winter Wheat ◽  
Vegetation Index ◽  
Vegetation Coverage ◽  
Growth Stages ◽  
Wheat Growth ◽  
Inversion Result ◽  
Growing Period ◽  
The Difference ◽  
Different Growth Stages

In the middle and late growing period of winter wheat, soil moisture is easily affected by saturation when using MODIS data to retrieve soil moisture. In this paper, in order to reduce the effect of the saturation caused by increasing vegetation coverage in middle and late stage of winter wheat, the Difference Vegetation Index (DVI) model was modified with different coefficients in different growth stages of winter wheat based on MODIS spectral data and LAI characteristics of variation. LAI was divided into three stages, LAI ≤ 1 < LAI ≤, 3 < LAI, and the adjusting coefficient of α=1, α=3, α=5, were taken to modifying the Difference Vegetation Index(DVI). The results show that the Modified Difference Vegetation Index (MDVIα) can effectively reduce the interference of saturation, and the inversion result of soil moisture in the middle and late period of winter wheat growth is obviously superior to the uncorrected inversion model of DVI.

Evaluating hyperspectral vegetation indices for estimating nitrogen concentration of winter wheat at different growth stages

2010 ◽  
Vol 11 (4) ◽  
pp. 335-357 ◽  
Author(s):  
Fei Li ◽  
Yuxin Miao ◽  
Simon D. Hennig ◽  
Martin L. Gnyp ◽  
Xinping Chen ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Nitrogen Concentration ◽  
Vegetation Indices ◽  
Growth Stages ◽  
Different Growth Stages

The Spatial Simulation of Soil Volumetric Moisture Content in Different Growth Stages of Peanut

2012 ◽  
Vol 10 (1) ◽  
pp. 155-161
Author(s):  
Yujian Yang ◽  
Shubo Wan ◽  
Jianhua Zhu ◽  
Zhicheng Wang
Keyword(s):  
Moisture Content ◽  
Growth Stages ◽  
Spatial Simulation ◽  
Volumetric Moisture Content ◽  
Different Growth Stages
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